<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>07</title>
    <style>
        .z1 {
            width: 200px;
            height: 200px;
            background-color: lightgreen;
            /*同时设置四周的边框*/
            border: 5px solid lightblue;
            /*设置下边框*/
            border-bottom: 15px dotted black;
            margin-bottom: 30px;
        }
        .z2 {
            width: 200px;
            height: 200px;
            background-color: lightgreen;
            /*设置四周的边框,当半径为宽度的一半时切出一个正圆*/
            border-radius: 50px;
            margin-bottom: 30px;
        }
        .z3 {
            width: 200px;
            height: 60px;
            background-color: lightgreen;
            border-radius: 30px;
        }
        .z4 {
            width: 200px;
            height: 200px;
            background-color: cyan;
            border: 10px solid blue;
            padding: 10px;
            /*切换为边框盒子*/
            box-sizing: border-box;
        }
        span {
            background-color: lightcoral;
        }
        .s1 {
            padding: 30px;
            margin: 30px;
        }

    </style>
</head>
<body>
<span>span</span><span class="s1">span</span><span>span</span>
    <div class="fu">
        <div class="z1"></div>
        <div class="z2"></div>
        <div class="z3"></div>
        <div class="z4"></div>
    </div>

</body>
</html>